5 stars: I find this game decently fun, despite the amount of ads in it. I appreciate that the ads are optional, but it's a whole lot harder if you're going to avoid them. If an option to spend some coins or watch the ad was an option, I'd be happy. I've poured a few hours into it now and normally just play it while watching Netflix or while waiting in queue for a PC game, but it's still a good time waster.
5 stars: They don't force you to pay real money or watch ads at all. You could play without spending a single cent or watching a single ad if you wanted to. I watch ads to get the big bonuses it gives you and it's easy to play for a long time (not like most idle games where you play for 5 mins and then close it for the day.) Buying islands makes it feel less repetitive too. Overall a good time waster.
2 stars: Updated review: dropped from 4 to 2 stars. I had earned money and watched an add to double it. I switched to another park, in the game. When I returned to the main park I lost all my money, over 7 trillion dollars. Original review: Entertaining game. There is one
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